Wedding Dress, sz 10, fits like sz 5

This was the first wedding dress I purchased. It has been hemmed for my height, 5’3, wearing flats. We trimmed the train too. As it was, 2 weeks prior to my wedding, I walked into a store and found another that I couldn’t walk away from. So this dress has literally only been tried on, maybe 3 times for no more than 10 min each time. It’s labeled as size 10, wedding dress don’t run the same as street sizes. I’m a 5 in jeans. Bra size 36DD, if this helps to understand how it may fit you. I did also have the straps tightened a little to feel more secure.